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ceramic ball bearings
While regular bearings are made from stainless steel, ceramic bearings are made from ceramic silicon nitride (Si2N4). Rolling resistance is the key trump card promoted by ceramic bearing fans. Because ceramic bearings are rounder with a smoother surface and more uniform size, friction is reduced and that can contribute to a less energy required to turn the cranks or spin the wheels. A ceramic bearing is also harder than steel bearings (up to 30%), which improves durability, and they also don’t rust so less maintenance should be required.
Ceramic Ball Bearings Successfully Apply In The Industrial Field
More applications are silicon nitride ceramic ball bearings. It has the advantages of high limit rotation speed, good precision retention, small starting torque, high rigidity, good dry running performance, and long service life, which is very suitable for maintaining high precision and long-time operation under high speed, high temperature, corrosion and radiation conditions. Ceramic Ball Bearing is mainly used in CNC machine tools and high-speed precision machinery, such as high-speed electric spindle bearings, machine tool spindle bearings, dental drill bearings, instrumentation bearings, computer hard drive bearings.
In addition, the hardness of the silicon nitride ceramic is 1 times higher than that of the bearing steel, and the elastic modulus is about 1/3 higher. Under the same load, the elastic deformation of the silicon nitride ceramic is small, so it has good running accuracy.
Advantages Of Ceramic Bearings
- They normally have a very high hardness (70-90 HRc) and elastic, or Young’s, modulus.
- Ceramic bearings can run lubrication free. Ceramic materials do not have this issue which makes them suitable for various applications which require a lube-free environment.
- They usually behave in a stable manner at high temperatures meaning there is less thermal expansion.
- Ceramics are non-metallic, nonferrous materials. Their high degree of corrosion resistance allows them to perform excellently in wet and chemically-corrosive environments.
- Many engineering ceramics also have a low density leading to improvements in bearings’ operational speeds, which is due to low centripetal forces and reduced friction.
- Due to the lack of free electrons in most ceramics, they are non-magnetic and excellent insulators.
Ceramic Ball Bearing Gallery
Common Cearmic Bearing Materials: Silicon Nitride,Zirconia and Silicon Carbide
Materials
Silicon Nitride combines the retention of high strength and creep resistance with oxidation resistance. It has better high temperature capabilities than most metals and its low thermal expansion coefficient gives a better thermal shock resistance in comparison with most ceramic materials.
Application
Space and Satellites
Many modern materials find their origins in pioneering space technology. Many ceramic materials that are now commonly used in bearings were developed for just this reason. Space exploration exhibits extreme loads and turbulent environments while demanding strict weight constraints and vacuum requirements.
Chemical and Medicalall
Many applications where contamination can be potentially life threatening, ceramic bearings provide the best solutions.Ceramic bearings do not react in the same way as standard steels because they are chemically inert compounds. This means they are not chemically reactive to corrosive materials and will not release harmful by-products.
Scientific Instrumentation
Some highly specialized instrumentation may require a fully non-magnetic system. If light is being measured or utilized in an instrument, a standard steel bearing must be avoided. Ceramic bearings are perfect for situations when magnetic resonance is an issue.
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